Dear All,
I am trying to send a mail using pl/sql package, but mail is not going, its throwing the below error.
The configured ip is 192.168.5.44 . The same i am calling in the procedure

ORA-29278: SMTP transient error: 421 Service not available
ORA-06512: at "SYS.UTL_SMTP", line 20
ORA-06512: at "SYS.UTL_SMTP", line 96
ORA-06512: at "SYS.UTL_SMTP", line 138
ORA-06512: at "APPS.XX_SEND_MAIL", line 21
ORA-06512: at line 2

The error is coming from your mail server. The error implies that there is no SMTP server listening on port P_SMTP_PORT on the machine P_SMTP_HOST. If you are saying that you are passing 192.168.5.44 as the P_SMTP_HOST and that you are letting P_SMTP_PORT be the default of 25, the error implies that there is no SMTP server running on port 25 on whatever machine has the IP address 192.168.5.44 on your network.

Note that this thread is probably more appropriate for the PL/SQL forum. Hopefully, one of the forum mods will move it there at some point.